I'm in the process of putting my new facility together and I want to know if anyone has had any experience with using sand in between the walls as a form of soundproofing. If so, can you please tell me the Pros & Cons of using it?
Another issue is that sand that hasn't been kiln dried starts out with a lot of moisture that will rot the walls it is put in. A practice space that a friend built used sand in plastic bags to keep the moisture from getting to the wood. Worked OK, but the space was only used for a couple of years, so I don't know about long term. In my studio I have used sand in the floating drum booth floor and in the walls of an iso cabinet successfully for many years, but I dried the sand thoroughly and chose the materials around the sand carefully.
Listen to both of these guys on the moisture issue. Sand-filled walls used to be all the rage, but mold has been an issue in all three of the builds I've known about. There are other solutions...I'd skip the sand and go on to something else.
I most definitely appreciate all of the feedback regarding this situation. Im now in the process of looking at soundproof drapes & blankets, especially in the booth because we do track like instruments in there